3 files changed, 37 insertions, 2 deletions

diff --git a/src/gui/kernel/qwidget.cpp b/src/gui/kernel/qwidget.cpp
index f7c795e..9b44f15 100644
--- a/src/gui/kernel/qwidget.cpp
+++ b/src/gui/kernel/qwidget.cpp
@@ -68,6 +68,7 @@
 # include "qt_cocoa_helpers_mac_p.h"
 # include "qmainwindow.h"
 # include "qtoolbar.h"
+# include <private/qmainwindowlayout_p.h>
 #endif
 #if defined(Q_WS_QWS)
 # include "qwsdisplay_qws.h"
@@ -3002,6 +3003,15 @@ bool QWidget::isFullScreen() const
 */
 void QWidget::showFullScreen()
 {
+#ifdef Q_WS_MAC
+    // If the unified toolbar is enabled, we have to disable it before going fullscreen.
+    QMainWindow *mainWindow = qobject_cast<QMainWindow*>(this);
+    if (mainWindow && mainWindow->unifiedTitleAndToolBarOnMac()) {
+        mainWindow->setUnifiedTitleAndToolBarOnMac(false);
+        QMainWindowLayout *mainLayout = qobject_cast<QMainWindowLayout*>(mainWindow->layout());
+        mainLayout->activateUnifiedToolbarAfterFullScreen = true;
+    }
+#endif // Q_WS_MAC
     ensurePolished();
 #ifdef QT3_SUPPORT
     if (parent())
@@ -3034,6 +3044,18 @@ void QWidget::showMaximized()
 
     setWindowState((windowState() & ~(Qt::WindowMinimized | Qt::WindowFullScreen))
                    | Qt::WindowMaximized);
+#ifdef Q_WS_MAC
+    // If the unified toolbar was enabled before going fullscreen, we have to enable it back.
+    QMainWindow *mainWindow = qobject_cast<QMainWindow*>(this);
+    if (mainWindow)
+    {
+        QMainWindowLayout *mainLayout = qobject_cast<QMainWindowLayout*>(mainWindow->layout());
+        if (mainLayout->activateUnifiedToolbarAfterFullScreen) {
+            mainWindow->setUnifiedTitleAndToolBarOnMac(true);
+            mainLayout->activateUnifiedToolbarAfterFullScreen = false;
+        }
+    }
+#endif // Q_WS_MAC
     show();
 }
 
@@ -3055,6 +3077,18 @@ void QWidget::showNormal()
     setWindowState(windowState() & ~(Qt::WindowMinimized
                                      | Qt::WindowMaximized
                                      | Qt::WindowFullScreen));
+#ifdef Q_WS_MAC
+    // If the unified toolbar was enabled before going fullscreen, we have to enable it back.
+    QMainWindow *mainWindow = qobject_cast<QMainWindow*>(this);
+    if (mainWindow)
+    {
+        QMainWindowLayout *mainLayout = qobject_cast<QMainWindowLayout*>(mainWindow->layout());
+        if (mainLayout->activateUnifiedToolbarAfterFullScreen) {
+            mainWindow->setUnifiedTitleAndToolBarOnMac(true);
+            mainLayout->activateUnifiedToolbarAfterFullScreen = false;
+        }
+    }
+#endif // Q_WS_MAC
     show();
 }
 
diff --git a/src/gui/widgets/qmainwindow.cpp b/src/gui/widgets/qmainwindow.cpp
index 1183be6..d971f61 100644
--- a/src/gui/widgets/qmainwindow.cpp
+++ b/src/gui/widgets/qmainwindow.cpp
@@ -78,6 +78,7 @@ public:
         : layout(0), explicitIconSize(false), toolButtonStyle(Qt::ToolButtonIconOnly)
 #ifdef Q_WS_MAC
             , useHIToolBar(false)
+            , activateUnifiedToolbarAfterFullScreen(false)
 #endif
 #if !defined(QT_NO_DOCKWIDGET) && !defined(QT_NO_CURSOR)
             , hasOldCursor(false) , cursorAdjusted(false)
@@ -89,6 +90,7 @@ public:
     Qt::ToolButtonStyle toolButtonStyle;
 #ifdef Q_WS_MAC
     bool useHIToolBar;
+    bool activateUnifiedToolbarAfterFullScreen;
 #endif
     void init();
     QList<int> hoverSeparator;
@@ -1501,8 +1503,6 @@ bool QMainWindow::event(QEvent *event)
     \i Before Qt 4.5, if you called showFullScreen() on the main window, the QToolbar would
         disappear since it is considered to be part of the title bar. Qt 4.5 and up will now work around this by pulling
         the toolbars out and back into the regular toolbar and vice versa when you swap out.
-        However, a good practice would be that turning off the unified toolbar before you call
-        showFullScreen() and restoring it after you call showNormal().
     \endlist
 
     Setting this back to false will remove these restrictions.
diff --git a/src/gui/widgets/qmainwindowlayout_p.h b/src/gui/widgets/qmainwindowlayout_p.h
index e1b981c..3e1a95d 100644
--- a/src/gui/widgets/qmainwindowlayout_p.h
+++ b/src/gui/widgets/qmainwindowlayout_p.h
@@ -335,6 +335,7 @@ public:
     void cleanUpMacToolbarItems();
     void fixSizeInUnifiedToolbar(QToolBar *tb) const;
     bool useHIToolBar;
+    bool activateUnifiedToolbarAfterFullScreen;
     void syncUnifiedToolbarVisibility();
     bool blockVisiblityCheck;
 #endif